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Note 3 - Investment Securities - Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Temporarily impaired securities, fair value	$ 580,505	$ 608,473
Temporarily impaired securities, unrealized losses	(122,975)	(87,204)
Temporarily impaired securities, fair value, less than 12 months	58,344	307,425
Temporarily impaired securities, unrealized losses, less than 12 months	(2,883)	(21,450)
Temporarily impaired securities, fair value, 12 months or longer	522,161	301,048
Temporarily impaired securities, unrealized losses, 12 months or longer	(120,092)	(65,754)
US Government Agencies Debt Securities [Member]
Temporarily impaired securities, fair value	43,969	44,451
Temporarily impaired securities, unrealized losses	(13,274)	(10,439)
Temporarily impaired securities, fair value, less than 12 months	6,056	20,517
Temporarily impaired securities, unrealized losses, less than 12 months	(194)	(1,831)
Temporarily impaired securities, fair value, 12 months or longer	37,913	23,934
Temporarily impaired securities, unrealized losses, 12 months or longer	(13,080)	(8,608)
Residential Mortgage-Backed Securities [Member]
Temporarily impaired securities, fair value	389,427	403,039
Temporarily impaired securities, unrealized losses	(76,935)	(57,863)
Temporarily impaired securities, fair value, less than 12 months	28,555	218,918
Temporarily impaired securities, unrealized losses, less than 12 months	(858)	(13,869)
Temporarily impaired securities, fair value, 12 months or longer	360,872	184,121
Temporarily impaired securities, unrealized losses, 12 months or longer	(76,077)	(43,994)
Commercial Mortgage-Backed Securities [Member]
Temporarily impaired securities, fair value	19,927	21,105
Temporarily impaired securities, unrealized losses	(5,376)	(4,381)
Temporarily impaired securities, fair value, less than 12 months	0	14,523
Temporarily impaired securities, unrealized losses, less than 12 months	0	(2,304)
Temporarily impaired securities, fair value, 12 months or longer	19,927	6,582
Temporarily impaired securities, unrealized losses, 12 months or longer	(5,376)	(2,077)
US States and Political Subdivisions Debt Securities [Member]
Temporarily impaired securities, fair value	122,899	133,265
Temporarily impaired securities, unrealized losses	(27,319)	(14,462)
Temporarily impaired securities, fair value, less than 12 months	22,739	47,446
Temporarily impaired securities, unrealized losses, less than 12 months	(1,825)	(3,404)
Temporarily impaired securities, fair value, 12 months or longer	100,160	85,819
Temporarily impaired securities, unrealized losses, 12 months or longer	(25,494)	(11,058)
Corporate Debt Securities [Member]
Temporarily impaired securities, fair value	2,961	4,973
Temporarily impaired securities, unrealized losses	(39)	(26)
Temporarily impaired securities, fair value, less than 12 months	994	4,973
Temporarily impaired securities, unrealized losses, less than 12 months	(6)	(26)
Temporarily impaired securities, fair value, 12 months or longer	1,967	0
Temporarily impaired securities, unrealized losses, 12 months or longer	(33)	0
Asset-Backed Securities [Member]
Temporarily impaired securities, fair value	1,322	1,640
Temporarily impaired securities, unrealized losses	(32)	(33)
Temporarily impaired securities, fair value, less than 12 months	0	1,048
Temporarily impaired securities, unrealized losses, less than 12 months	0	(16)
Temporarily impaired securities, fair value, 12 months or longer	1,322	592
Temporarily impaired securities, unrealized losses, 12 months or longer	$ (32)	$ (17)

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